RESUMO
The effect of the concentration of disperse titanium-containing oxide photocatalyzers on the destruction of safranine in aqueous solutions has been studied. It was found that the rate constant of safranine destruction increases with the content of the catalyzer in solution and reaches a maximum value at a catalyzer concentration of < or = 3 g/l, after which it depends no longer on the catalyzer concentration. The flattening of the rate constant curve is caused by light scattering and the narrowing of the reaction scope due to an increase in the optical density of the solution. In the region where the rate constant increases with the catalyzer concentration, the rise in the rate constant is determined by an increase in the specific area of the catalyzer; in the region of the plateau, the rate constant is practically independent on the specific area of the catalyzer.
